I just got an order of fish, and one of them looked fine, the other one not so much. When I took him out of the package, I actually thought he was dead. The one I quarantined off for an hour, gave some stress coat, and he started to show some really good improvment, looking like, well a normal fish again. So, I put him into his new home. He doesn't look terrible, but he's certanly not looking good. He barely swims, and when he does, it looks like he doesn't even use his tail fin, only his side ones. His bud is being very gentle with him, basically just following him around and keeping other fish away. He's also breathing really hard. Is there anything I can do for him? I feel really bad for him. Thanks in advance!